4_strength_09

4_strength_09 - a load of 45,000 lb • What is the tensile...

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Notes 1160: Strength 1 Tugboat pulling a barge. The drag force of the barge in the water is 10,000 lb. steel cable: o = 500 ft E = 29,000,000 lb/in 2 A = 0.70 in 2 Calculate the stress and the strain in the cable. How much does the cable stretch? What’s So Important about STRENGTH? 500 ft
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Notes 1160: Strength 2 10,000 # stress strain stretch σ= P A ε σ = E = P A E
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Notes 1160: Strength 3 Strength Material stress required to break a material Structure load required to break a structure If I know “breaking stress” for a material, I can calculate how much load a structure can carry. “breaking” stress “failure” stress “ultimate” stress }
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Notes 1160: Strength 4 A F steel rod σ u = 40,000 lb/in 2 σ u F A = max F A u max = Example
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Notes 1160: Strength 5 A circular specimen fails in a tension test at
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Unformatted text preview: a load of 45,000 lb. • What is the tensile strength of the material? Area d = ⋅ π 4 4 A F max u = σ • Material? ===> high strength steel? Notes 1160: Strength 6 Stress-Strain Behavior Near and At Failure • Glass • Behavior is linear up to failure • Failure is sudden – Behavior is “brittle” σ ε σ u tension test Notes 1160: Strength 7 • Structural steel σ u ε σ tension test • Observe much stretching before failure (nonlinear) – Behavior is “ductile” Notes 1160: Strength 8 steel nylon biscuit raspberry jelly stiffness strength • Stiffness and strength are two key properties, but not the only important ones, which describe a solid...
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4_strength_09 - a load of 45,000 lb • What is the tensile...

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